[Bug 234403] [acpi_ibm] Support ThinkPad battery charge start/stop control

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234403

--- Comment #10 from rkoberman at gmail.com ---
I just hit a minor nit. I can't set dev.acpi_ibm.0.bat0_charge_stop to 100. I
get "sysctl: dev.acpi_ibm.0.bat0_charge_stop=100: Invalid argument".  99 works
fine. Since the range is really 1-100, perhaps you should subtract 0ne from the
input value to pass the 09-99 value to ACPI. 

I also have noted the values are sticky, lasting through reboots and even power
cycles, so are being stored in the BIOS configuration.

Still working well for me. I keep it at 85 when I'm home and bump it to 99 when
traveling as I am more frequently not on AC and the extra 15% is very useful.
It's really like to get this into the system, but I'd like to know more about
it on newer systems. The Tx20s are over 8 years old and I expect to be
upgrading mine before too much longer.

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